Implement native speech recognition for the launcher.

chrome/browser/ui/app_list/start_page_service.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/app_list/start_page_service.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/user_metrics.h"
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/media/media_stream_infobar_delegate.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/hotword_service.h"
 #include "chrome/browser/search/hotword_service_factory.h"
+#include "chrome/browser/ui/app_list/app_list_speech_recognizer.h"
 #include "chrome/browser/ui/app_list/recommended_apps.h"
 #include "chrome/browser/ui/app_list/start_page_observer.h"
 #include "chrome/browser/ui/app_list/start_page_service_factory.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 100 matching lines @@
   observers_.AddObserver(observer);
 }
 
 void StartPageService::RemoveObserver(StartPageObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void StartPageService::AppListShown() {
   if (!contents_) {
     LoadContents();
-  } else if (contents_->GetWebUI()) {
+  } else if (contents_->GetWebUI() &&
+             !HotwordService::IsExperimentalHotwordingEnabled()) {
     // If experimental hotwording is enabled, don't enable hotwording in the
     // start page, since the hotword extension is taking care of this.
     bool hotword_enabled = HotwordEnabled() &&
         !HotwordService::IsExperimentalHotwordingEnabled();
     contents_->GetWebUI()->CallJavascriptFunction(
         "appList.startPage.onAppListShown",
         base::FundamentalValue(hotword_enabled));
   }
 }
 
 void StartPageService::AppListHidden() {
   if (contents_->GetWebUI()) {
     contents_->GetWebUI()->CallJavascriptFunction(
         "appList.startPage.onAppListHidden");
   }
   if (!app_list::switches::IsExperimentalAppListEnabled())
     UnloadContents();
+
+  if (HotwordService::IsExperimentalHotwordingEnabled() &&
+      speech_recognizer_.get()) {
+    speech_recognizer_->Stop();
+  }
 }
 
 void StartPageService::ToggleSpeechRecognition() {
   DCHECK(contents_);
   speech_button_toggled_manually_ = true;
   if (!contents_->GetWebUI())
     return;
 
-  if (webui_finished_loading_) {
-    contents_->GetWebUI()->CallJavascriptFunction(
-        "appList.startPage.toggleSpeechRecognition");
-  } else {
+  if (!webui_finished_loading_) {
     pending_webui_callbacks_.push_back(
         base::Bind(&StartPageService::ToggleSpeechRecognition,
                    base::Unretained(this)));
+    return;
   }
+
+  if (HotwordService::IsExperimentalHotwordingEnabled()) {
+    if (!speech_recognizer_.get()) {
+      std::string profile_locale;
+#if defined(OS_CHROMEOS)
+      profile_locale = profile_->GetPrefs()->GetString(
+          prefs::kApplicationLocale);
+#endif
+      if (profile_locale.empty())
+        profile_locale = g_browser_process->GetApplicationLocale();
+
+      speech_recognizer_ = new AppListSpeechRecognizer(this, profile_locale);
+    }
+
+    speech_recognizer_->Start();
+    return;
+  }
+
+  contents_->GetWebUI()->CallJavascriptFunction(
+      "appList.startPage.toggleSpeechRecognition");
 }
 
 bool StartPageService::HotwordEnabled() {
   if (HotwordService::IsExperimentalHotwordingEnabled()) {
     return HotwordServiceFactory::IsServiceAvailable(profile_) &&
         profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled);
   }
 #if defined(OS_CHROMEOS)
   return HotwordServiceFactory::IsServiceAvailable(profile_) &&
       profile_->GetPrefs()->GetBoolean(prefs::kHotwordSearchEnabled);
@@ skipping 28 matching lines @@
 }
 
 void StartPageService::OnSpeechSoundLevelChanged(int16 level) {
   FOR_EACH_OBSERVER(StartPageObserver,
                     observers_,
                     OnSpeechSoundLevelChanged(level));
 }
 
 void StartPageService::OnSpeechRecognitionStateChanged(
     SpeechRecognitionState new_state) {
+
+  if (HotwordService::IsExperimentalHotwordingEnabled() &&
+      new_state == SPEECH_RECOGNITION_READY &&
+      speech_recognizer_.get()) {
+    speech_recognizer_->Stop();
+  }
+
   if (!InSpeechRecognition(state_) && InSpeechRecognition(new_state)) {
     if (!speech_button_toggled_manually_ &&
         state_ == SPEECH_RECOGNITION_HOTWORD_LISTENING) {
       RecordAction(UserMetricsAction("AppList_HotwordRecognized"));
     } else {
       RecordAction(UserMetricsAction("AppList_VoiceSearchStartedManually"));
     }
   } else if (InSpeechRecognition(state_) && !InSpeechRecognition(new_state) &&
              !speech_result_obtained_) {
     RecordAction(UserMetricsAction("AppList_VoiceSearchCanceled"));
@@ skipping 41 matching lines @@
       ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 }
 
 void StartPageService::UnloadContents() {
   contents_.reset();
   webui_finished_loading_ = false;
 }
 
 }  // namespace app_list